That totally depends on what you're looking for. Some of my favorites are

- Primer (academic subjects)

- Linking your Thinking (tutorials for Obsidian)

- Stuff Made Here (Entertaining and impressive robotics projects)

- a life engineered (all sorts of career advice stuff)

- Reducible (animations of CS subjects)

- ByteByteGo (short and informative videos about system design)

- Wolfgang's Channel (all sorts of home networking/selfhosted videos)

- Jack Rhysider (entertaining and informative podcasts about cyber security and cyber crime)

- Dark History (disaster documentaries)